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> I have an iPhone and I have seen Mycelium for iOS
As far as I can tell, the iOS version of Mycelium is no longer being developed at all ^1. I find that a bit sad, since it was one of the only non-ad laden iOS wallets (yeah, there’s Jaxx, but its interface was never appealing to me).
My recommendation is to use Electrum via your KeepKey, rather than in addition to it. What I mean by that is that you should not enter your recovery sentence into it, and instead you should follow these instructions, https://imgur.com/a/sxHij and take advantage of the full security of your hardware wallet.
I don’t want to cause panic/alarm/spread FUD but, if you’ve restored your recovery sentence into something other than another hardware wallet, it would be a *really* good idea to start over with fresh recovery words, and transfer everything there. Otherwise you leave yourself open to possible vulnerabilities in your soft wallet, which could be much easier to exploit than if you only used your hardware wallet.
1: FWIW, the Android version is a completely different codebase, still being developed but by a different group.